I manage AdWords accounts for several attorneys who want to bid $100 for each of their top targeted keyword phrases. They would bid $200 if they could.
Both the medical and legal professions commonly bid the max for several keywords. That is why mesothelioma is usually the highest paying keyword. There is lots of money in both cancer treatments and lawsuits.
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -- Benjamin Franklin